Feedback from Supercritical Disk Accretion Flows; Two-dimensional Radiation-hydrodynamic Simulations of Stable and Unstable Disks with Radiatively Driven Outflows

The supercritical disk accretion flow with radiatively driven outflows is studied based on twodimensional radiation-hydrodynamic simulations for a wide range of the mass input rate, Ṁinput, which is the mass supplied from the outer region to the disk per unit time. The α-prescription is adopted for the viscosity. We employ α = 0.5, as well as α = 0.1 for Ṁinput ≥ 3 × 10 LE/c 2 and only α = 0.5 for Ṁinput ≤ 10 LE/c , where LE is the Eddington luminosity and c is the speed of light. The quasi-steady disk and radiately driven outflows form in the case in which the mass input rate highly exceeds the critical rate, Ṁinput > 3 × 10 LE/c . Then, the disk luminosity as well as the kinetic energy output rate by the outflow exceeds the Eddington luminosity. The moderately supercritical disk, Ṁinput ∼ 10 − 10 LE/c , exhibits limit-cycle oscillations. The disk luminosity goes up and down across the Eddington luminosity, and the radiatively driven outflows intermittently appear. The time averaged mass, momentum, and kinetic energy output rates by the outflow as well as the disk luminosity increase with increase of the mass input rate, ∝ Ṁ input for α = 0.5 and ∝ Ṁ input for α = 0.1. Our numerical simulations show that the radiatively driven outflow model for the correlation between black hole mass and bulge velocity dispersion proposed by Silk & Rees and King is successful if Ṁinputc /LE ∼ a few 10 (α = 0.5) or > ∼ a few (α = 0.1). Subject headings: accretion: accretion disks — black hole physics — galaxies: nuclei — hydrodynamics — radiative transfer